Cookie deletion does not properly set the domain

[flowerseses]

So, in using starsessions for a project, I've run into an issue - while running everything on localhost, the library behaves perfectly. However, as soon as I put it in a docker container, behind a reverse proxy, or even try to deploy it, calling
request.session.clear() seems to not set cookie_domain for the cookie that's being deleted. So, in effect, the old cookie remains unchanged, while the session is deleted in the backend, and a new cookie for localhost is set with the right expiry and session id and everything.

The issue happens here:

starsessions/starsessions/middleware.py

Lines 96 to 102 in b002235

	headers = MutableHeaders(scope=message)
	header_value = "{}={}; {}".format(
	self.cookie_name,
	f"null; path={path}; expires=Thu, 01 Jan 1970 00:00:00 GMT;",
	self.security_flags,
	)
	headers.append("Set-Cookie", header_value)

I might be misunderstanding something, however, but if this is an actual issue, I'll attach a PR suggestion to fix it.